Scherzer was scheduled to start today versus Minnesota, but Duane Below will make the start instead. General manager Dave Dombrowski told Anthony Odoard of MLB.com that the Tigers “have confidence” that Scherzer will remain on the active roster and start Sunday.

He apparently suffered the injury while doing some between-starts running and wasn’t happy with how it felt when testing it with a bullpen session yesterday.

Scherzer leads the American League with 11.4 strikeouts per nine innings, but for the second straight season he’s allowed opponents to bat above .270 with a disappointing ERA (4.98). He has been much improved since a brutal April, posting a 3.95 ERA and 87/19 K/BB ratio in 66 innings since May 1.